Scissors of welding machine

Abstract

The utility model discloses a pair of welding machine scissors, which belongs to the technical field of welding machine scissors control, is applied to a cold rolling pickling line, and comprises a rack, a hydraulic cylinder, an air cylinder, an upper shearing device, a lower shearing device and an elastic boosting device, the upper shearing device and the lower shearing device are located on the upper side and the lower side of the strip steel shearing position correspondingly. The hydraulic cylinder is arranged on the rack, connected with the upper shearing device and used for driving the upper shearing device to move up and down; the air cylinder is located on the portion, below the hydraulic cylinder, of the rack, connected with the lower shearing device and used for driving the lower shearing device to move in the direction opposite to the direction of the upper shearing device. The elastic boosting device is located at the end, away from the air cylinder, of the bottom of the lower shearing device and used for enabling the two sides of the lower shearing device to be evenly stressed when the strip steel is sheared. The problem that when the shear shank of the welding machine moves up and down during shearing, the shear shank is blocked due to uneven stress is solved, abrasion of the joint shaft sleeve is reduced, and the service life of the shaft sleeve is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding machine scissors control, in particular to a welding machine scissors. Background Art

[0002] The American GUIDE welding scissors currently on the market use hydraulic drive for the upper scissors and upper guide pins for directional shearing, and cylinder drive for the lower scissors, which use lower guide pins for directional shearing. This type of welding scissors is driven on one side, that is, the hydraulic cylinder and the cylinder are located on the same side of the welding scissors. The cylinder drives the lower scissors up and down through the connecting rod. If the cylinder moves frequently for a long time, the sleeve on the rotating pin of the connecting rod on the driving side is easy to wear, causing uneven force on the connecting rod. At the same time, the thrust provided by the cylinder is limited, which can easily lead to the lower scissors being unable to move and the connecting rod node being stuck, causing the welder to be unable to weld normally, causing the production line to slow down or even stop.

[0003] Therefore, it is urgent to develop a welding machine scissors that can avoid the scissors frame from getting stuck due to uneven force when shearing up and down. Utility Model Content

[0004] In order to at least solve the problem of jamming of the scissor frame of the welding machine in the prior art due to uneven force when the scissor frame moves up and down during shearing, the utility model provides the following technical solutions: a welding machine scissors, applied to a cold rolling pickling line, the welding machine comprises: a frame and a welding machine scissors, the welding machine scissors comprises: a hydraulic cylinder, a cylinder, an upper shearing device, a lower shearing device and an elastic booster device;

[0005] The upper shearing device and the lower shearing device are respectively located at the upper and lower sides of the strip shearing position;

[0006] The hydraulic cylinder is arranged on the frame and connected to the upper shearing device, and is used to drive the upper shearing device to move up and down;

[0007] The cylinder is located on the frame below the hydraulic cylinder, and the cylinder is connected to the lower shearing device and is used to drive the lower shearing device to move in the opposite direction to the upper shearing device;

[0008] The elastic booster device is located at the bottom of the lower shearing device on one side away from the cylinder, and is used to make the two sides of the lower shearing device evenly stressed when shearing the strip steel.

[0009] Optionally, in the above-mentioned welding machine scissors, the elastic force boosting device comprises: a base, a spring and a spring fixing tube;

[0010] The base is arranged on the frame;

[0011] The spring fixing tube is arranged vertically and the lower end is connected to the base;

[0012] The spring is sleeved on the spring fixing tube;

[0013] The lower end of the spring is connected to the base through the spring fixing tube, and the upper end of the spring is connected to the lower shearing device through a fixing bolt.

[0014] Optionally, in the above-mentioned welding machine scissors, the length of the spring is greater than the length of the spring fixing tube.

[0015] Optionally, in the above-mentioned welding machine scissors, the upper shearing device comprises: an upper scissors and an upper knife holder;

[0016] The upper scissors are installed at the bottom of the upper knife holder, the blade end of the upper scissors is arranged downward, and an angle is arranged between the upper scissors and the horizontal plane;

[0017] The hydraulic cylinder pushes the upper tool holder down to the shearing position through the first swing pair.

[0018] Optionally, in the above-mentioned welding machine scissors, the lower shearing device includes: lower scissors and a lower knife holder;

[0019] The lower knife holder is located directly below the upper scissors, and a boss is provided at the bottom of the lower knife holder;

[0020] The lower scissors are installed on the top of the lower blade holder, and the blade end of the lower scissors is arranged upward;

[0021] The cylinder pushes the lower tool holder to rise to the shearing position through the second swing pair;

[0022] The upper end of the elastic force boosting device is connected to the boss, and the lower end of the elastic force boosting device is connected to the frame.

[0023] Optionally, in the above-mentioned welding machine scissors, the welding machine scissors: further include: an upper guide post and a lower guide post;

[0024] The upper guide column is installed on the frame above the upper tool holder, the upper guide column is vertically arranged and one end is connected to the upper tool holder, and an upper guide sleeve is arranged on the outer side of the upper guide column;

[0025] The upper guide column and the upper guide sleeve move relative to each other to prevent the upper tool holder from deviating from the vertical direction;

[0026] The lower guide column is installed on the frame below the lower tool holder, the lower guide column is vertically arranged and one end is connected to the lower tool holder, and a lower guide sleeve is arranged on the outer side of the lower guide column;

[0027] The lower guide column and the lower guide sleeve move relative to each other to prevent the lower tool holder from deviating from the vertical direction.

[0028] Optionally, in the above-mentioned welding machine scissors, a gap is provided between the upper guide post and the upper guide sleeve, and between the lower guide post and the lower guide sleeve.

[0029] Optionally, in the above-mentioned welding machine scissors, the first swing pair includes: a plurality of upper connecting rods;

[0030] A plurality of the upper connecting rods are connected in sequence through rotating pins to form a swing pair of the upper scissors;

[0031] A shaft sleeve is arranged on the outer side of the rotating pin.

[0032] Optionally, in the above-mentioned welding machine scissors, the second swing pair includes: a plurality of lower connecting rods;

[0033] A plurality of the lower connecting rods are sequentially connected through rotating pins to form a swing pair of the lower scissors;

[0034] A shaft sleeve is arranged on the outer side of the rotating pin.

[0035] Optionally, in the above-mentioned welding machine scissors, the number of the upper guide pillars and the number of the lower guide pillars are both two.

[0036] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0037] By arranging an elastic booster device on the side of the bottom of the lower tool holder away from the cylinder, the elastic booster device and the cylinder drive the lower tool holder to rise from both sides respectively. At the same time, the elastic booster device can also balance the thrust of the cylinder on the lower tool holder, so that the two sides of the bottom of the lower tool holder are evenly and smoothly subjected to force and rise to the shearing position, thereby solving the problem of jamming of the scissors frame of the welding machine due to uneven force when it moves up and down during shearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a welding machine scissors provided in an embodiment of the utility model;

[0039] Figure 2 for Figure 1 A schematic diagram of the specific structure of the medium-elastic force booster device;

[0040] In the figure: 1, frame; 2, hydraulic cylinder; 3, cylinder; 4, upper shearing device; 401, upper scissors; 402, upper tool holder; 5, first swing pair; 6, lower shearing device; 601, lower scissors; 602, lower tool holder; 603, boss; 7, second swing pair; 8, elastic booster; 801, base; 802, spring; 803, spring fixing tube; 804, bolt hole; 9, upper guide column; 10, lower guide column; 11, upper guide sleeve; 12, lower guide sleeve; 13, rotating pin; 14, shearing position. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] See also Figure 1-2 The utility model provides the following technical solutions: a welding machine scissors, applied to a cold rolling pickling line, the welding machine comprises: a frame 1 and a welding machine scissors. The welding scissors are driven on one side (side) by a joint transmission. The welding machine scissors comprise: a hydraulic cylinder 2, a cylinder 3, an upper shearing device 4 (including an upper scissors 401 and a knife seat where it is located), a lower shearing device 6 (including a lower scissors 601 and a knife seat where it is located) and an elastic booster device 8. The upper shearing device 4 and the lower shearing device 6 are respectively located at the strip shearing position 14 (refer to Figure 1The upper and lower sides of the upper shear device 401 and the lower shear device 601 are arranged on the frame 1, i.e., the horizontal line between the upper scissors 401 and the lower scissors 601 shown in the figure, i.e., the position where the strip is located), so that during the shearing operation, the upper shearing device 4 (referring to the upper scissors 401) abuts against the upper surface of the strip (not shown in the figure), and the lower shearing device 6 (referring to the lower scissors 601) abuts against the lower surface of the strip. The hydraulic cylinder 2 is arranged on the frame 1, and the hydraulic cylinder 2 is connected to the upper shearing device 4 through a swing sub-joint. The hydraulic cylinder 2 converts hydraulic energy into mechanical motion, thereby driving the upper shearing device 4 to move up and down. The cylinder 3 is located on the frame 1 below the hydraulic cylinder 2, and the cylinder 3 is connected to the bottom of the lower shearing device 6 through a swing sub-joint. The cylinder 3 converts air pressure energy into mechanical energy, thereby driving the lower shearing device 6 to move in the opposite direction to the upper shearing device 4, so that the lower shearing device 6 and the upper shearing device 4 can simultaneously approach or move away from the shearing position 14. It should be noted that the hydraulic cylinder 2 and the cylinder 3 are both on the same side of the welding machine scissors. The elastic booster 8 is located at the bottom of the lower shearing device 6, away from the cylinder 3, that is, the elastic booster 8 and the cylinder 3 are respectively located on both sides of the lower knife holder 602, so that the elastic booster 8 and the cylinder 3 cooperate with each other to make the lower shearing device 6 (referring to the lower knife holder 602) rise or fall smoothly in the vertical direction. Preferably, the upper end of the elastic booster 8 is connected to the lower shearing device 6, and the lower end of the elastic booster 8 is connected to the frame 1. This embodiment does not limit the specific connection method of the elastic booster 8 with the frame 1 and the lower shearing device 6. During operation, the cylinder 3 drives the lower shearing device 6 to move upward from one side, and at the same time, the elastic booster 8 on the other side is stretched and deformed by the lower shearing device 6, and generates a downward elastic force acting on the frame 1. According to the principle that the forces between objects act in opposite directions, the frame 1 applies an equal reverse force (which can be understood as an upward thrust) to the elastic booster 8 on the lower shearing device 6. The reverse force is the same as the driving force provided by the cylinder 3, so that the bottom sides of the lower shearing device 6 are evenly stressed (that is, the reverse force can balance the thrust of the cylinder 3). The cylinder 3 and the elastic booster 8 cooperate with each other to push the lower shearing device 6 to rise to the shearing position 14 in a balanced manner. At this time, the upper shearing device 4 is also driven by the hydraulic cylinder 2 to descend to the shearing position 14, and the upper shearing device 4 and the lower shearing device 6 cooperate with each other to bite the strip steel. Since the force on the bottom of the lower shearing device 6 is balanced, the upper scissors 401 and the lower scissors 601 of the welding machine are smooth and unobstructed during the shearing operation. The sheared strip steel enters the next process (i.e., welding operation), and at the same time, the upper shearing device 4 rises back to the highest position, and the lower shearing device 6 descends back to the lowest position. At this time, the elastic booster device 8 returns to its original state. It should be noted that the hydraulic cylinder 2, the cylinder 3 and the frame 1 of the welding machine are all prior art, and their specific structures are not limited in this embodiment.

[0044] Reference Figure 1As shown, the elastic booster device 8 includes: a base 801, a spring 802 and a spring fixing tube 803. The base 801 is fixed on the frame 1. It should be noted that a bolt hole 804 is provided on the base 801, so that the base 801 is installed on the frame 1 by fixing bolts. The spring fixing tube 803 is vertically arranged, and the lower end of the spring fixing tube 803 is fixedly connected to the base 801. The spring 802 is sleeved on the outside of the spring fixing tube 803, and the lower end of the spring 802 is connected to the base 801 through the spring fixing tube 803, and the upper end of the spring 802 is extended by the elastic force of the spring to be close to the bottom of the shearing device 6 (referring to the boss 603 of the lower knife holder 602). When the lower shearing device 6 rises under the push of the cylinder 3, the spring 802 is stretched by the lower shearing device 6, deformed and generates a downward elastic force acting on the frame 1, and the frame 1 generates an upward thrust on the spring 802 acting on the lower shearing device 6, so that the bottom two sides of the lower shearing device 6 are evenly stressed and can rise steadily. When the strip shearing operation is completed, the hydraulic cylinder 2 pushes the upper shearing device 4 upward, and the cylinder 3 pushes the lower shearing device 6 down to the lowest position. At this time, the spring 802 is reset, thereby ensuring the balance of the two ends of the lower shearing device 6.

[0045] The length of the spring 802 (before deformation) is greater than the length of the spring fixing tube 803, so that the spring 802 can maintain a certain tightness and stability before working, that is, the spring 802 has a certain pre-tightening force. Generally speaking, the pre-tightening force of the spring 802 should be between 10% and 20% of the rated load, so that the spring 802 will not be excessively deformed or lose elasticity during work, and the specific setting can be based on actual conditions.

[0046] As an embodiment of the specific structure of the upper shearing device 4, in this embodiment, the upper shearing device 4 includes: an upper scissors 401 and an upper knife holder 402. The upper scissors 401 are installed at the bottom of the upper knife holder 402, and the blade end of the upper scissors 401 is set downward. An angle is set between the upper scissors 401 and the horizontal plane, and the angle is an acute angle, which can reduce the wear of the upper scissors 401. The hydraulic cylinder 2 pushes the upper knife holder 402 up and down on one side through the joint transmission (referring to the first swing pair 5). During the shearing operation, the hydraulic cylinder 2 drives the upper knife holder 402 to move downward to the shearing position 14.

[0047] As an embodiment of the specific structure of the above-mentioned lower shearing device 6, in this embodiment, the lower shearing device 6 includes: a lower scissors 601 and a lower knife holder 602. The lower knife holder 602 is located directly below the upper scissors 401. A boss 603 is provided on the bottom of the lower knife holder 602 away from the cylinder 3. The boss 603 and the upper end of the elastic booster device 8 (specifically the spring 802) are tightly attached by the elastic force of the spring, and the lower end of the elastic booster device 8 (specifically the base 801) is connected to the frame 1 by a fixing bolt. The lower scissors 601 are installed on the top of the lower knife holder 602, and the blade end of the lower scissors 601 is set upward. The cylinder 3 pushes the lower knife holder 602 up and down on one side through the joint transmission (referring to the second swing pair 7). Before the shearing operation, the cylinder 3 and the elastic booster device 8 cooperate with each other to make the lower knife holder 602 rise to the shearing position 14, and the lower scissors 601 and the upper scissors 401 bite each other to shear the strip steel.

[0048] In order to prevent the upper tool holder 402 and the lower tool holder 602 from deviating from the vertical direction when they are lifted or lowered, the welding machine scissors also include an upper guide column 9 and a lower guide column 10. The upper guide column 9 is installed on the frame 1 above the upper tool holder 402. The upper guide column 9 is vertically arranged, one end of the upper guide column 9 is connected to the upper tool holder 402, and an upper guide sleeve 11 is arranged on the outer side of the upper guide column 9. During the shearing action, the hydraulic cylinder 2 drives the upper tool holder 402 to descend, and the upper tool holder 402 simultaneously drives the upper guide column 9 to descend along the length direction of the upper guide sleeve 11, that is, the upper guide column 9 and the upper guide sleeve 11 perform relative motion, thus guiding the upper tool holder 402, so that the upper tool holder 402 always descends in the vertical direction without deviation. The lower guide column 10 is installed on the frame 1 below the lower tool holder 602. The lower guide column 10 is vertically arranged, one end of the lower guide column 10 is connected to the lower tool holder 602, and an upper guide sleeve 12 is arranged on the outer side of the lower guide column 10. During shearing, the cylinder 3 drives the lower knife holder 602 to rise, and the elastic booster device 8 is deformed to generate a downward elastic force acting on the frame 1. At the same time, the frame 1 applies an upward thrust to the lower knife holder 602 through the elastic booster device 8, so that the bottom two sides of the lower knife holder 602 are evenly stressed and can rise steadily. At this time, the lower knife holder 602 also drives the lower guide column 10 to rise along the length direction of the upper guide sleeve 12, that is, the lower guide column 10 and the upper guide sleeve 12 move relative to each other, so as to guide the lower knife holder 602, so that the lower knife holder 602 always rises in the vertical direction without deviation. Similarly, when the strip shearing is completed, the upper knife holder 402 rises vertically under the guidance of the upper guide column 9, and the lower knife holder 602 drops vertically back to the lowest position under the guidance of the lower guide column 10.

[0049] In order to reduce the friction caused by thermal expansion and contraction of the guide pillars, the diameters of the upper guide pillars 9 and the lower guide pillars 10 can be ground down by 0.05 mm while ensuring the accuracy of the welding machine scissors. In this way, a gap of 0.1 mm is maintained between the upper guide pillar 9 and the upper guide sleeve 11, and between the lower guide pillar 10 and the upper guide sleeve 12.

[0050] This embodiment is an embodiment of the specific structure of the first swing pair 5. In this embodiment, the first swing pair 5 includes: a plurality of upper connecting rods. The plurality of upper connecting rods are connected in sequence through a rotating pin 13 to form a swing pair of the upper scissors 401. The rotating pin 13 can ensure the smooth rotation of the swing pair joint. A shaft sleeve is arranged on the outer side of the rotating pin 13 to play a role in heat dissipation.

[0051] This embodiment is an embodiment of the specific structure of the second swing pair 7. In this embodiment, the second swing pair 7 includes: a plurality of lower connecting rods. The plurality of lower connecting rods are connected in sequence through a rotating pin 13 to form a swing pair of the lower scissors 601. The rotating pin 13 can ensure the smooth rotation of the swing pair joint. A shaft sleeve (not shown in the figure) is provided on the outer side of the rotating pin 13 to play a role in heat dissipation. It should be noted that the elastic booster device 8 can not only balance the thrust of the cylinder 3, but also effectively reduce the wear of the shaft sleeve and extend the service life of the shaft sleeve.

[0052] The number of upper guide pins 9 and lower guide pins 10 is two. The two upper guide pins 9 are distributed at intervals on the top of the upper tool holder 402. The two lower guide pins 10 are distributed at intervals on the bottom of the lower tool holder 602.

[0053] Working principle of welding machine scissors: when the strip head or tail is pushed to the shearing position 14, the lateral and axial positions of the strip are adjusted, the cylinder 3 is energized, and the cylinder 3 pushes the second swing pair 7 to make the lower tool holder 602 rise, and the lower tool holder 602 stretches the spring 802 upward, and the spring 802 is deformed to generate a downward elastic force acting on the frame 1, and the frame 1 generates an upward thrust on the spring 802 to act on the lower tool holder 602, so that the forces on both sides of the bottom of the lower tool holder 602 are balanced, and the lower tool holder 602 reaches the shearing position 14 below the strip smoothly under the cooperation of the cylinder 3 and the spring 802, and the hydraulic cylinder 2 pushes the upper tool holder 402 down to the shearing position 14 above the strip through the first swing pair 5, and the upper blade 401 and the lower blade 601 cooperate with each other to bite the strip, and the strip shearing is completed, and then the upper tool holder 402 rises to the highest position, and the lower tool holder 602 drops back to the lowest position.

[0054] When the shearing operation is completed, the welding inlet and outlet clamps move to the welding position, and the upper and lower welding heads start the horizontal welding operation.

[0055] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A welding machine scissors, used in a cold rolling pickling line, the welding machine comprising: The frame and welding machine scissors are characterized in that the welding machine scissors include: a hydraulic cylinder, a gas cylinder, an upper shearing device, a lower shearing device and an elastic boosting device; The upper shearing device and the lower shearing device are respectively located at the upper and lower sides of the strip shearing position; The hydraulic cylinder is arranged on the frame and connected to the upper shearing device, and is used to drive the upper shearing device to move up and down; The cylinder is located on the frame below the hydraulic cylinder, and the cylinder is connected to the lower shearing device and is used to drive the lower shearing device to move in the opposite direction to the upper shearing device; The elastic booster device is located at the bottom of the lower shearing device on one side away from the cylinder, and is used to make the two sides of the lower shearing device evenly stressed when shearing the strip steel.

2. The welding machine scissors according to claim 1, characterized in that: The elastic booster device comprises: a base, a spring and a spring fixing tube; The base is arranged on the frame; The spring fixing tube is arranged vertically and the lower end is connected to the base; The spring is sleeved on the spring fixing tube; The lower end of the spring is connected to the base through the spring fixing tube, and the upper end of the spring is connected to the lower shearing device through a fixing bolt.

3. The welding machine scissors according to claim 2, characterized in that: The length of the spring is greater than the length of the spring fixing tube.

4. The welding machine scissors according to claim 1, characterized in that: The upper shearing device comprises: an upper scissors and an upper knife holder; The upper scissors are installed at the bottom of the upper knife holder, the blade end of the upper scissors is arranged downward, and an angle is arranged between the upper scissors and the horizontal plane; The hydraulic cylinder pushes the upper tool holder down to the shearing position through the first swing pair.

5. The welding machine scissors according to claim 4, characterized in that: The lower shearing device comprises: lower scissors and a lower knife holder; The lower knife holder is located directly below the upper scissors, and a boss is provided at the bottom of the lower knife holder; The lower scissors are installed on the top of the lower blade holder, and the blade end of the lower scissors is arranged upward; The cylinder pushes the lower tool holder to rise to the shearing position through the second swing pair; The upper end of the elastic force boosting device is connected to the boss, and the lower end of the elastic force boosting device is connected to the frame.

6. The welding machine scissors according to claim 5, characterized in that: The welding machine scissors also include: an upper guide post and a lower guide post; The upper guide column is installed on the frame above the upper tool holder, the upper guide column is vertically arranged and one end is connected to the upper tool holder, and an upper guide sleeve is arranged on the outer side of the upper guide column; The upper guide column and the upper guide sleeve move relative to each other to prevent the upper tool holder from deviating from the vertical direction; The lower guide column is installed on the frame below the lower tool holder, the lower guide column is vertically arranged and one end is connected to the lower tool holder, and a lower guide sleeve is arranged on the outer side of the lower guide column; The lower guide column and the lower guide sleeve move relative to each other to prevent the lower tool holder from deviating from the vertical direction.

7. The welding machine scissors according to claim 6, characterized in that: A gap is provided between the upper guide post and the upper guide sleeve, and between the lower guide post and the lower guide sleeve.

8. The welding machine scissors according to claim 4, characterized in that: The first swing pair includes: a plurality of upper connecting rods; A plurality of the upper connecting rods are connected in sequence through rotating pins to form a swing pair of the upper scissors; A shaft sleeve is arranged on the outer side of the rotating pin.

9. The welding machine scissors according to claim 5, characterized in that: The second swing pair includes: a plurality of lower connecting rods; A plurality of the lower connecting rods are sequentially connected through rotating pins to form a swing pair of the lower scissors; A shaft sleeve is arranged on the outer side of the rotating pin.

10. The welding machine scissors according to claim 6, characterized in that: The number of the upper guide pillars and the number of the lower guide pillars are both two.

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